... , 20mm, 22mm, 25mm2) Engineers' ball pein hammer: 1 / 4lb, 1 / 2lb, 3 / 4lb, 1lb, 1 1 / 2lb, 2lb, 2 1 / 2lb, 3lb 3) Double faced smiths' hammer: 2 / 3 ... / 4 / 6 / 8 / 10 / 12 / 14 / 16 / 18 / 20lb ... . / 16oz. / 24oz. / 28oz. / 32oz. 6) Stone hammers: 0.8kg, 1kg, 1.25kg, 1.5kg, 2kg Hammers